锥面球面密封结构特殊螺纹有限元分析

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英文篇名：Finite element analysis of premium thread of conical-spherical seal structure 作者：张乐 ; 王建军 ; 贾飞鹏 ; 杨尚谕 英文作者：ZHANG Le;WANG Jianjun;JIA Feipeng;YANG Shangyu;College of Mechanical Engineering,Xi'an Shiyou University;CNPC Tubular Goods Research Institute,State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials; 关键词：应力分析 ; 密封面 ; 台肩面 ; 接触压力 ; 接触长度 英文关键词：stress analysis;;sealing surface;;shoulder surface;;contact pressure;;contact length 中文刊名：石油化工应用 英文刊名：Petrochemical Industry Application 机构：西安石油大学机械工程学院;中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室; 出版日期：2019-05-25 出版单位：石油化工应用 年：2019 期：05 基金：国家科技重大专项课题“复杂结构井、丛式井设计与控制新技术”,项目编号:2017ZX05009-003 语种：中文; 页：55-59 页数：5 CN：64-1058/TE ISSN：1673-5285 分类号：TE931.2

摘要

考虑丛式井多级压裂过程中,套损、螺纹泄漏现象严重,利用ANSYS软件建立锥面-球面特殊螺纹模型,研究了内压一定时,不同轴向力下特殊螺纹接头等效应力变化规律和密封面、台肩面接触压力随接触长度变化规律。结果表明,拉伸载荷过大,接箍密封端第一扣完整螺纹牙附近为危险断裂面,螺纹两端粘扣严重。密封面、台肩面接触压力随拉伸载荷增大而减小,但只要拉伸载荷在600 MPa内,密封面接触长度并不会随拉伸载荷增大持续减小。压缩载荷使特殊螺纹密封面、台肩面接触压力、接触长度增加,但同时也会让特殊螺纹接头应力增加,对螺纹连接不利。
        Considering the serious casing damage and thread leakage during multi-stage fracturing in cluster wells, this paper uses ANSYS software to establish a conical-spherical premium thread model, and studies the variation of von mises stress of premium threaded joints under different axial forces and the variation of contact pressure between sealing surface and shoulder surface with contact length.The results show that the tension load is too large, the dangerous fracture surface is near the complete thread tooth of the first buckle at the sealing end of the coupling, and the two ends of the thread are seriously bonded. The contact pressure of the sealing surface and shoulder surface decreases with the increase of the tensile load,however,as long as the tension load is within 600 MPa,the contact length of the sealing surface will not continue to decrease with the increase of the tension load. Compression load led to increases of contact pressure and length of the premium thread sealing surface and shoulder surface, at the same time, it also increases the stress of the premium thread joint,which is unfavorable to the thread connection.

引文

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